Secondary storage (backing storage) Flashcards
When is data written to secondary storage?
when data X longer being actively used, for retrieval at a later time.
Is it faster or slower to access data from secondary storage or memory?
Slower
Flash drive suitability?
Moving relatively
small files from work
-> home.
External Hard Drive suitability?
Backing up a home
computer system.
CD/DVD/Blu-ray disc suitability?
Storing multimedia
files
Magnetic tape suitability?
Backing large
commercial servers on
multiple tapes.
Flash drive , external hard drive, CD/DVD/Blu-ray, magnetic tape durability?
Most-
Flash drive
CD/DVD/Blu-ray
Magnetic Tape
External hard drive
Least-
Flash drive , external hard drive, CD/DVD/Blu-ray, magnetic tape portability?
They are all portable.
Flash drive , external hard drive, CD/DVD/Blu-ray, magnetic tape speed?
Most-
Flash drive
External hard drive
CD/DVD/Blu-ray
Magneti tape
Least-
Where are solid state drives used?
Solid state drives are used as data storage in portable devices such as cameras and mobile phones.
Features of solid state drives?
Extremely reliable = X moving parts, unlike magnetic storage
Low power consumption + high speed access
what can SSD provide + instead of what?
Solid state drives can provide secondary storage instead of magnetic discs
Description of Secure digital cards (SD)?
Where are they used?
Secure Digital (SD) cards and microSD cards are used in portable devices such as smartphones, cameras and tablets.
Description of USB flash drives?
USB flash drives are convenient compact forms of flash memory for sharing and transferring data.
What are optical devices +examples?
What is used to read+write?
Where is data encoded?
Compact Discs (CDs) that store 700 MB
Digital Versatile Discs (DVDs) that store 4.7GB
Blu-ray discs that store 50 GB
Optical discs use a laser to read + write data
Data in encoded as a series of pits in a spiral track running from the inside to the outside of the disc
What is Cloud storage?
A contemporary storage facility
Allows users to store their data on third party servers
Data can be accessed from multiple devices
Positives of cloud?
-Available on multiple devices
-Purchasing additional storage is the responsibility of the host
-Can be used as a backup service, off site
Negatives of cloud?
Internet connection is required
Some data issues where companies store data outside the EU (see DPA 1988)
Reliant on the host for ensure the data is held securely
What is Magnetic storage and what is it used on?
This technology is used in hard disks and tapes.
Data is stored on a magnetic media, which can be a disk or a tape
Data is written to a disk using a write-head
Data can then be read by a read-head
